Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta)
For the first time, nonlinear gyrokinetic simulations of I-mode plasmas are performed and compared with experiment. I-mode is a high confinement regime, featuring energy confinement similar to H-mode, but without enhanced particle and impurity particle confinement [D. G. Whyte et al., Nucl. Fusion 5...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics (AIP)
2017
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| Online Access: | http://hdl.handle.net/1721.1/108785 https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-4464-150X https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0001-7700-848X https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0002-9001-5606 |
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| author | Holland, C. Candy, J. Theiler, C. White, Anne E. Howard, Nathaniel Thomas Creely, Alexander James Chilenski, Mark Alan Hubbard, Amanda E Hughes Jr, Jerry Sierchio, Jennifer M. Sung, Choongki Walk Jr, John R Whyte, Dennis G Mikkelsen, David Edlund, Eric Matthias Kung, Chun C Petty, Clinton C. Reinke, Matthew Logan Theiler, Christian Greenwald, Martin J. Marmar, Earl S. Rice, John E. |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory Holland, C. Candy, J. Theiler, C. White, Anne E. Howard, Nathaniel Thomas Creely, Alexander James Chilenski, Mark Alan Hubbard, Amanda E Hughes Jr, Jerry Sierchio, Jennifer M. Sung, Choongki Walk Jr, John R Whyte, Dennis G Mikkelsen, David Edlund, Eric Matthias Kung, Chun C Petty, Clinton C. Reinke, Matthew Logan Theiler, Christian Greenwald, Martin J. Marmar, Earl S. Rice, John E. |
| author_sort | Holland, C. |
| collection | MIT |
| description | For the first time, nonlinear gyrokinetic simulations of I-mode plasmas are performed and compared with experiment. I-mode is a high confinement regime, featuring energy confinement similar to H-mode, but without enhanced particle and impurity particle confinement [D. G. Whyte et al., Nucl. Fusion 50, 105005 (2010)]. As a consequence of the separation between heat and particle transport, I-mode exhibits several favorable characteristics compared to H-mode. The nonlinear gyrokinetic code GYRO [J. Candy and R. E. Waltz, J Comput. Phys. 186, 545 (2003)] is used to explore the effects of E × B shear and profile stiffness in I-mode and compare with L-mode. The nonlinear GYRO simulations show that I-mode core ion temperature and electron temperature profiles are more stiff than L-mode core plasmas. Scans of the input E × B shear in GYRO simulations show that E × B shearing of turbulence is a stronger effect in the core of I-mode than L-mode. The nonlinear simulations match the observed reductions in long wavelength density fluctuation levels across the L-I transition but underestimate the reduction of long wavelength electron temperature fluctuation levels. The comparisons between experiment and gyrokinetic simulations for I-mode suggest that increased E × B shearing of turbulence combined with increased profile stiffness are responsible for the reductions in core turbulence observed in the experiment, and that I-mode resembles H-mode plasmas more than L-mode plasmas with regards to marginal stability and temperature profile stiffness. |
| first_indexed | 2024-09-23T07:59:31Z |
| format | Article |
| id | mit-1721.1/108785 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T07:59:31Z |
| publishDate | 2017 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/1087852023-02-26T02:08:27Z Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) Holland, C. Candy, J. Theiler, C. White, Anne E. Howard, Nathaniel Thomas Creely, Alexander James Chilenski, Mark Alan Hubbard, Amanda E Hughes Jr, Jerry Sierchio, Jennifer M. Sung, Choongki Walk Jr, John R Whyte, Dennis G Mikkelsen, David Edlund, Eric Matthias Kung, Chun C Petty, Clinton C. Reinke, Matthew Logan Theiler, Christian Greenwald, Martin J. Marmar, Earl S. Rice, John E. Lincoln Laboratory Massachusetts Institute of Technology. Department of Mathematics Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Whyte, Dennis White, Anne E. Howard, Nathaniel Thomas Creely, Alexander James Chilenski, Mark Alan Greenwald, Martin J Hubbard, Amanda E Hughes Jr, Jerry Marmar, Earl S Rice, John E Sierchio, Jennifer M. Sung, Choongki Walk Jr, John R Whyte, Dennis G Mikkelsen, David Edlund, Eric Matthias Kung, Chun C Petty, Clinton C. Reinke, Matthew Logan Theiler, Christian For the first time, nonlinear gyrokinetic simulations of I-mode plasmas are performed and compared with experiment. I-mode is a high confinement regime, featuring energy confinement similar to H-mode, but without enhanced particle and impurity particle confinement [D. G. Whyte et al., Nucl. Fusion 50, 105005 (2010)]. As a consequence of the separation between heat and particle transport, I-mode exhibits several favorable characteristics compared to H-mode. The nonlinear gyrokinetic code GYRO [J. Candy and R. E. Waltz, J Comput. Phys. 186, 545 (2003)] is used to explore the effects of E × B shear and profile stiffness in I-mode and compare with L-mode. The nonlinear GYRO simulations show that I-mode core ion temperature and electron temperature profiles are more stiff than L-mode core plasmas. Scans of the input E × B shear in GYRO simulations show that E × B shearing of turbulence is a stronger effect in the core of I-mode than L-mode. The nonlinear simulations match the observed reductions in long wavelength density fluctuation levels across the L-I transition but underestimate the reduction of long wavelength electron temperature fluctuation levels. The comparisons between experiment and gyrokinetic simulations for I-mode suggest that increased E × B shearing of turbulence combined with increased profile stiffness are responsible for the reductions in core turbulence observed in the experiment, and that I-mode resembles H-mode plasmas more than L-mode plasmas with regards to marginal stability and temperature profile stiffness. United States. Department of Energy (Contract No. DE-FC02-99ER54512-CMOD) United States. Department of Energy. Office of Science (Contract No. DE-AC02- 05CH11231) 2017-05-09T17:58:42Z 2017-05-09T17:58:42Z 2015-05 2014-12 Article http://purl.org/eprint/type/JournalArticle 1070-664X 1089-7674 http://hdl.handle.net/1721.1/108785 White, A. E., N. T. Howard, A. J. Creely, M. A. Chilenski, M. Greenwald, A. E. Hubbard, J. W. Hughes, et al. “Nonlinear Gyrokinetic Simulations of the I-Mode High Confinement Regime and Comparisons with Experimenta).” Physics of Plasmas 22, no. 5 (May 2015): https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-4464-150X https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0001-7700-848X https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0002-9001-5606 en_US http://dx.doi.org/10.1063/1.4921150 Physics of Plasmas Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Institute of Physics (AIP) Prof. Whyte via Chris Sherratt |
| spellingShingle | Holland, C. Candy, J. Theiler, C. White, Anne E. Howard, Nathaniel Thomas Creely, Alexander James Chilenski, Mark Alan Hubbard, Amanda E Hughes Jr, Jerry Sierchio, Jennifer M. Sung, Choongki Walk Jr, John R Whyte, Dennis G Mikkelsen, David Edlund, Eric Matthias Kung, Chun C Petty, Clinton C. Reinke, Matthew Logan Theiler, Christian Greenwald, Martin J. Marmar, Earl S. Rice, John E. Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title | Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title_full | Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title_fullStr | Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title_full_unstemmed | Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title_short | Nonlinear gyrokinetic simulations of the I-mode high confinement regime and comparisons with experimenta) |
| title_sort | nonlinear gyrokinetic simulations of the i mode high confinement regime and comparisons with experimenta |
| url | http://hdl.handle.net/1721.1/108785 https://orcid.org/0000-0003-2951-9749 https://orcid.org/0000-0002-0026-6939 https://orcid.org/0000-0002-4464-150X https://orcid.org/0000-0002-3616-8484 https://orcid.org/0000-0002-4438-729X https://orcid.org/0000-0002-5283-0546 https://orcid.org/0000-0001-8319-5971 https://orcid.org/0000-0001-7700-848X https://orcid.org/0000-0001-8324-4227 https://orcid.org/0000-0002-9001-5606 |
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